Mechanism for manufacturing rubber shoes.



3 SHEETS-SHEET 1.

PATENTED MAR. 17, 1903.

' R. J. DOUGHTY. MRUHANISM PoR MANUFACTURING RUBBER SHOES. APPLIATION FILED SEPT. 16, 1901.

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No. 722,822. PATBNTBD lM2217, 1903'. '11. J. DOUGHTY.

MECHANISM FOR MANUFACTURING RUBBER SHO-ES. APPLIOATION FILED SEPT. 1e, 1901.

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-PATENTED MAR. 17, 1903.

H. J. DOUGHTY.

MEGHANISM POR MANUFACTURING RUBBER SHOES.

APPLICATION FILED SEPT. 16, 1901.

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AT1' DENZ'Y UNITED STATES ATENT OFFICE.

HENRY J. DOUGIITY, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR TO AT.- LANTIC RUBBER SHOE COMPANY, OF TRENTON, NEW JERSEY, A COR- PORATION OF NEW JERSEY.

NIECHANISIVI FOR MANUFACTURING RUBBER SHOES.

SPECIFICATION forming part 0f Letters Fatent No. 722,822, dated. March 17, 1903. Application filed September 16, 1901. Serial No. 75,448. (No model.)

To all whom it may concern:

Be it known that I, HENRY J. DOUGHTY, a citizen of the United States, residing at Providence, in the county of Providence and State of Rhode Island, have invented a new and useful Improvement in Mechanism forManufacturing Rubber Shoes, of which the following is a specification.`

This invention has reference to an improvement in an apparatus for molding and vulcanizing rubber boots or shoes, and is particularly applicable to the production of rubber shoes.

The object of the invention is to facilitate the manufacture of rubber shoes and to produce a better quality of shoes at less cost.

The invention consists in the peculiar and novel construction of the mechanism and the combination of the parts, more fully described hereinafter.

In describing the means used by mein carrying out my invention I have illustrated and will describe the apparatus used by me in the manufacture of rubber shoes. By changes in the forms ofthe molds and the work-supports the same apparatus may be used in the manufacture of rubber boots.

In carrying out my invention I employ a four-part mold having when closed the form and configuration of the outer surface of the desired rubber shoe. I employ a compound toggle-lever mechanism for operating three parts of the mold and support the fourth part of the mold on a yielding support. Three parts of the mold are provided with charnbers supplied, preferably, with steam, and the fourth part of the mold is connected with a pipe supplying air, steam, gas, or other fluid and forms the support of the shoe to be molded and vulcanized.

Figure l is a top view o f my improved mechanism, showing the parts in the position when the mold is closed and a shoe is being molded. Fig. 2 is an elevation showing a front view of the machine on the left half of the figure and a vertical sectional View on the right half of the figure. Fig. 3 is a transverse sectional view of the four-part mold, showing one form of the work-support connected with the yieldingly-supported fourth part of the mold. Fig. 4 is a horizontal sectional view of the mold, showing the mold Eig. s.

open and the third or sole part of the mold in view. Fig. 5 is a sectional view of the upper part of the mold, showing the yieldinglysupported part of the mold connected Withthe air or iuid supply. Fig. 6 is a sectional view of the yieldingly-supported part of the mold provided with a perforated work-support having practically the form of the shoe. Fig. 7 is a sectional view of the same parts as shown in Fig. 6,7takeu at right angle to the former. Fig. 8 is a sectional View of the yieldingly-supported part of the mold provided With a modified form of work-support. Fig. 9 is a sectional view at a right angle to Fig. l0 is a sectional view of the yieldingly-supported part of the mold, showing the shoe connected thereto. an end View of the part of the mold shown in Fig. l0.

Similar marks of reference indicate corr'espondiug parts in all the figures. l

In the drawings, da indicate the end frames of the machine, forming the support of the improved mechanism for manufacturing rubber shoes, ct a substantial strut secured to the end frames, and a2 the top plate or table secured to the end frames. This table is provided near each end with the slots *a3 and a4. The table cl2 is provided with the brackets d5, one on each side, which form the journalsupports for the shaft a6, on which the handlever a7 and the double-ended arm a3 are secured.

The abutments b b are secured to the table a2 by bolts extending through the slots 01.3, as is shown in Fig. 2, and may be adjusted on the table. The abutments b b are provided with the lugs b b. The rods b2 b2 extend through the lugs b bon the fronty and the rear of the machine. The rods b2 b2 are screwthreaded at their ends and are rigidly secured to the abutments by the nuts 53123, bearing on the opposite sides of the lugs b b. The chambered blocks b4 b4 are provided at their ends with the lugs b5, through which the rods b2 b2 extend, the rods forming the supports of the blocks and the Ways on which the blocks slide. The levers bs b are pivotally secured to the blocks b4 and are connected by the shaft I?? with the lever-frame bs, pivotally secured to the abutments b b. The levers b and lever-frames bs are secured to the blocks Fig. 1l is IOO The blocks b4 b4 are provided with the ribs b9,

the projecting upper surface of which is beveled and engages with the beveled ribs on the sides of the chambered block 1910. The chambers in the blocks b4 bi'and blo are connected with the steam-pipes h, bw, and 1913 and are supplied by steam.

The two side molds c c are detachably secured to the blocks b4 b4 and have their inner faces formed to correspond with the surfaces of the two sides of the shoe and to fit on the rib c2 of the work-support c3. The sole-mold c4 is detachably secured to the chambered block b1. The work-support cB has the duct c5, terminating in a chamber. The tube c6, in screw-thread engagement with the block c7, extends horizontally and bears, when the mold is closed, ou the stem of the springpressed check-valve cs in the block o9, preferably secured to the side mold c and connected with the air-pipe C10.

Referring to Fig. 5, the plug c, in screwthread engagement with the block c, permits of the spring adjustment of the check-valve c8 and gives access to the valve. The locknut C12 is set into a recess in the block c7 and bears on an elastic packing, and the tube c( is in screw-thread engagement with the locknut. By this construction the tube may be accurately adjusted to operate the checkvalve o8. The Work-support c3 is supported by means of the rod r, which' is of such length as will permit the mold to adjust itselfto the two side molds c c, as is desired, and operate the check-valve'.

The machine is preferably operated by the toggle-jointed levers a9 and 01,10, the togglejoints of which are connected `by the links @12, each to one end of the arm a8. The levers a are connected to the shafts 67 67 and the levers al@ am to the thrust-blocks cl3 als. The lever arrangement is shown in Fig. 2 in the locked position, all the toggle-jointed levers having the toggle-joints in a straight line withthe pivoted ends of the levers, in which positionthe toggle-jointed levers exert the greatest force and resist endwise pressure. One movement of the hand-lever a7 in the direction of the arrow draws the side molds apart, and by reason of the beveled surfaces of the ribs b9, formed on the side molds to cor- -respond with the beveled surfaces on the andqualties of rubber shoes.

to close the two side molds upon the shoe and work-support.

Rubber shoes are designed and almost exclusively used as overshoes. The parts subj ected to the greatest strains and wear are the portions inclosing the mouth of the shoe and the sole. The more yielding and soft the rest of the shoe forming the uppers is the better it fits the shoe and the more readily the rubber shoe yields to the movement of the shoeclad foot. I have constructed a numberof work-supports adapted for different Weights Figs. 6 and 7 show the work-support c3 provided with a preferably-detachable perforated last C17. Figs. 8 and 9 show the work-support c3 provided with a sole-plate c1, connected to the worksupport by the rib 018,' and for certain qualities of shoes the work-support c3 (shown in Figs. IO and 11) is used by itself, without any sole-plate or other attachment. The surface 013 extends around'the work-support and receives the portion of the rubber shoe extending around the opening or mouth of the shoe. The surface c on the work-support enters and closely fits the side molds c c. When the perforated last c17 is used in connection With the work-support, the shoe to be molded and vulcanized loosely fits over the perforated last 01T. When the shoe placed on this perforated last and work-support is inserted and the mold closed, the unyielding and heated metal surface of the side molds c c bears on and compresses the portion of the rubber` shoe inclosing the mouth of the shoe and supported on the surface c13 of the work-support, while the surface c bears tightly on the side molds, so that the rubber inclosing the mouth of the shoe makes a tight joint. The air under pressure enters the work-support and the last through the duct c5 and passing through the perforations acts on the inside of the rubber shoe and presses the outer surfaces of the shoe into contact with the rigid heated surfaces of the side molds and the sole-mold c4. The Whole shoe is thus molded and vulcanized. It receives the shape and finish of the highly-nished molds. The portion inclosing the mouthl of the shoe being vulcanized While subjected to greater pressure between unyielding surfaces becomes somewhat more rigid, tougher, and stronger than thev rest of the shoe subjected tov airpressure. The perforated last when used with the work-support has the advantage of supporting the green shoe. Permitting the air to act on all parts of the shoe it prevents wrinkles and does not strain the rubber, as a solid last is liable to do. To produce a more durable rubber shoe, I compress the sole of the shoe between two metal surfaces during the process of molding and vulcanizing the shoe. To secure this result, I use the worksupport shown in Figs. 8 and 9, in which the rib 018 extends from the work-support c3 to the sole-plate o16. This plate has the configuration of the inside of the sole of `the finished IOO IIO

shoe and acts to compress the rubber or rubber-impregnated material of the sole between the sole-plate c16 and the sole-mold c4 during the vulcanizing process. The margin of the shoe surrounding the mouth of the shoe is also strengthened by compression between the surface cl3 on the shoe-support and the mold. The work-support c3, provided with the surfaces cl3 and 014, as shown in Figs. 10 and 11, may be used to support and expand the green shoe during the process of molding and vulcanizing the shoe. By securing the margin surrounding the mouth of the shoe on the surface cl3 the shoe is expanded. As soon as the mold is closed the side molds compress the margin and form a tight joint. The compressed air entering the shoe presses all parts below the margin against the surfaces of the side molds and the sole-mold, giving to the material of the shoe the form of the molds and setting the forms by the heat of the molds vulcanizing the rubber. By regulating the airpressure any degree of compressure of the uppers may be secured, while the sole and the margin around the mouth of the shoe may be compressed by the molds to secure the desired strength and rigidity. A rubber shoe having soft yielding uppers, a more rigid sole, and compressed margin around the mouth of the shoe can be more conveniently put on over the shoe-clad foot and more readily removed. It fits the uppers of the shoe better and may be made materiallylighter than rubber shoes as heretofore made.

I do not wish to confine myself to the exact construction of the various parts of the mechanism as herein shown and described, as these may be modified or changed without materially affecting my invention.`

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A mold for making rubber shoes by interior pressure, consisting of outer movable parts and an interior part forming a worksupport and provided with an air-inlet and adapted to cooperate with the outer parts to compress the work and form an air-tightjoint, as described.

2. A mold for molding and vulcanizing rubber shoes having one part of the mold formed to receive the margin around the mouth of the shoe and provided with an air-inlet, whereby the shoe may be supported in the expanded condition, as described.

3. In an organized mechanism for manufacturing rubber shoes, the combination with a sole-mold, two side molds for forming the sides and uppers of the shoe and a work-.support, of means for moving the side molds in opposite directions to open the top of the mold and facilitate the insertion of the work, as described.

4. In an organized mechanism for manu- 5. In an organized mechanism for manufacturing rubber shoes, the combination with the work-support, the sides of the mold and the sole-mold, of the chambered side blocks, the chambered block supporting the solemold, of means for operating the side blocks and lifting the sole-block, as described.

6. In a mold for molding and vulcanizing rubber shoes, the combination with a worksupport and a surface on the work-support cooperating with parts of the mold to compress a part of the rubber shoe between unyielding surfaces, of an air-supply connected with the work-support, whereby part of the rubber shoe may be subjected to pressure between rigid surfaces and part to the elastic air-pressure, as described.

7. The combination with tho work-support c3, the air-inlet duct c5 and the surfaces c13 and c, of the side molds c c, surfaces on the side molds corresponding with the surfaces c13 and C14 on the work-support, whereby the margin of the shoe around the mouth of the shoe is clamped between the rigid surfaces and air under pressure may be forced into the shoe, as described.

8. In combination with the work-support the side molds and the sole-mold, of the blocks b4 b4, the ribs b9 b9 on the chambered blocks, the chambered block bw and the beveled ribs on the same, whereby the closing of the side molds acts to raise the sole-mold, as described.`

9. In a mold for forming rubber shoes by interior pressure, an inside part forming an air-inlet, a margin to support the work and provided with the surfaces 013 and 014, as described.

10. The combination with the work-support c3 and the surfaces C13 and 014 on the same, of the rib c18 and the sole-plate o16, whereby parts of the shoe may be pressed between the rigid part of the work-support and the mold, as described.

1l. In a mold for forming rubber shoes by interior pressure, an inside part consisting of a perforated hollow last having an air-inlet, as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY J. DOUGHTY.

Witnesses:

B. M. SIMMs, J osEPH A. MILLER.

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